EP0104600B1 - Centrifuge rotor having a closable windshield - Google Patents

Centrifuge rotor having a closable windshield Download PDF

Info

Publication number
EP0104600B1
EP0104600B1 EP83109379A EP83109379A EP0104600B1 EP 0104600 B1 EP0104600 B1 EP 0104600B1 EP 83109379 A EP83109379 A EP 83109379A EP 83109379 A EP83109379 A EP 83109379A EP 0104600 B1 EP0104600 B1 EP 0104600B1
Authority
EP
European Patent Office
Prior art keywords
rotor
windshield
shaft
lower portion
buckets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83109379A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0104600A2 (en
EP0104600A3 (en
Inventor
William Andrew Romanauskas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP0104600A2 publication Critical patent/EP0104600A2/en
Publication of EP0104600A3 publication Critical patent/EP0104600A3/en
Application granted granted Critical
Publication of EP0104600B1 publication Critical patent/EP0104600B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/04—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers
    • B04B5/0407—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers for liquids contained in receptacles
    • B04B5/0414—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers for liquids contained in receptacles comprising test tubes
    • B04B5/0421—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers for liquids contained in receptacles comprising test tubes pivotably mounted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/02—Casings; Lids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/02—Casings; Lids
    • B04B2007/025—Lids for laboratory centrifuge rotors

Definitions

  • This invention relates to a centrifuge rotor, and in particular, to a swinging bucket centrifuge rotor having a windshield a portion which is movable with respect to the rotor shaft from a rest to a closed position.
  • the relative centrifugal force developed by a rotor is windage limited. That is, for a given rotor volume the maximum operating speed at which that rotor may rotate is usually limited by the drive torque available to the rotor at that speed. Thus increasing rotor volume, as by increasing the number or size of the buckets, may have an adverse effect upon the amount of relative centrifugal force able to be generated by the rotor.
  • Driving torque is then applied to the rotor causing the buckets to swing from their rest position (in which the axis of each bucket lies parallel to the rotor's axis of rotation) to their operating position (in which the axis of each bucket extends substantially perpendicularly to the axis of rotation).
  • the windshield encloses the buckets while they occupy all attitudes from the rest to the operating position.
  • the present invention provides a centrifuge apparatus wherein the windage generated by a swinging bucket rotor of a given volume may be decreased thereby increasing the relative centrifugal force able to be generated by a rotor at that volume.
  • the closing force is the result of the pressure differential generated by the centrifugal pumping action of the rotor and buckets.
  • a centrifuge rotor of the swinging bucket type generally indicated by reference numeral 10 includes a central hub 12 having a lower skirt portion 14 thereon.
  • a central axial bore 16 having a truncated conical portion 18 extends through the interior of the rotor 10.
  • a drive adapter 20 having an enlargement 22 thereon extends through the bore 16.
  • the upper end of the drive adapter 20 is provided with threads 24 which receive a cover drive nut 26.
  • the enlargement 22 of the adapter 20 is provided with an annular groove 30 in which drive posts 34 (only one of which is visible in Figure 1) are disposed (see also Figure 3).
  • a rotor gyro 36 having drive pins 38 thereon extends into the conical portion 18 of the bore with the pins 38 extending into the groove 30.
  • the adapter 20 is itself provided with a central axial bore 40.
  • a knob 41 having an elongated threaded rod 42 connected thereto extends through the bore 40 to secure the rotor 10 to the gyro 36.
  • the knob 41 clamps a cover 54 to the hub portion 12 of the rotor 10 to prevent relative motion between the center of gravity of the rotor 10 and the cover 54.
  • the gyro 36 is operatively connected to a drive motor 44 as shown by the schematic linkage 46. Rotation of the gyro 36 brings the pins 38 thereon into driving engagement with the pins 34 (believed best seen in Figure 3) to thereby rotate the rotor 10.
  • the rotor 10 includes a plurality of arms 48 extending radially outwardly from the central hub 12 of the shaft.
  • a plurality of swinging buckets 52 is pivotally mounted by any suitable means of attachment (such as trunnion pins 50) between pairs of adjacent ones of the arms 48.
  • the buckets 52 are pivotable from a rest position ( Figure 1) in which the axis A of each of the buckets 52 is substantially parallel to the rotor's axis of rotation S to an operating position in which the axes A of the buckets 52 lie generally perpendicular to the axis S.
  • a rest position Figure 1
  • the axis A of each of the buckets 52 is substantially parallel to the rotor's axis of rotation S
  • an operating position in which the axes A of the buckets 52 lie generally perpendicular to the axis S.
  • the axis of each bucket may assume any predetermined orientation with respect to the axis S.
  • An upperwindshield portion 54 ( Figures 1 and 4) is removably mounted to the drive cover nut 26.
  • the upperwindshield portion 54 is provided with a hexagonal opening 56 ( Figure 4) which is received on the drive nut 26 so as to prevent rotation of upper windshield 54 with respect to the hub 12.
  • the outer peripheral edge of the upper windshield portion 54 terminates in a mating surface 60.
  • a lowerwindshield portion 62 ( Figures 1 and 5) has a central region 64 through which an opening 66 extends.
  • the lower windshield portion 62 is movably mounted on the skirt portion 14 of the shaft between an open position (Figure 1) defined by a lower stop 68 mounted to the shaft and a closed position ( Figure 2).
  • the outer periphery of the lower windshield portion 62 terminates in a mating surface 70.
  • the upper windshield portion 54 is provided with a circumferential annular band 71 the inside diameter of which is greater than the outside diameter of the lower windshield portion 62.
  • the upper windshield portion 54 is stiffer than the lower windshield portion 62.
  • the lower windshield portion 62 is movable along the skirt 14 in a direction parallel to the axis S between the open and closed positions.
  • the lower windshield portion 62 is nonrotatably mounted with respect to the skirt 14.
  • the skirt 14 is substantially hexagonal in cross section.
  • the opening 66 in the lower windshield portion 62 is correspondingly shaped ( Figure 5).
  • the lower windshield portion 62 is thus slidably but nonrotatably mounted to the skirt 14.
  • the upper and lower windshield portions may be made nonrotatably mounted to the shaft by any suitable expedient.
  • the windshield portions 54 and 62 are fabricated of any suitable material, preferably a high strength aluminum alloy.
  • the skirt 14 and boundary surface of the opening 66 in the lower windshield 62 are provided with smooth, highly polished finishes to expedite the sliding movement of the lower windshield with respect thereto.
  • the surface of the skirt 14and the boundary of the opening 66 are provided with an anodized aluminum hardcoat.
  • any suitable solid film lubrication may be utilized whatever construction materials are used to fabricate the rotor and windshield portions.
  • the buckets 52 respond to the motive energy applied to the rotor by pivoting from the rest position ( Figure 1) to the operating position ( Figure 2) in which the axes A of the buckets 52 extend substantially perpendicular to the axis S of rotation of the rotor.
  • the rotation of the rotor results in the generation of a closing force acting in the direction of the arrow 72 which moves the lower portion 62 of the windshield to the closed position.
  • the closing force is generated by a pressure differential defined in the region between the portions of the windshield.
  • air in the vicinity of the rotating buckets is pumped radially outwardly relative to the axis S of the rotor to thereby define a lower pressure region substantially between the upper and lower windshield portions.
  • the lower portion 62 of the windshield responds to the pressure force generated by the pressure differential formed between the exterior of the lower portion and the interior thereof by the centrifuged.pumping action of the rotor arms and the buckets 52to displace the lower portion 62 along the skirt 14 in the direction of the arrow 72 (parallel to the axis S) from the open position to the closed position.
  • the lowerwindshield portion 62 is sized and weighted to insure that the closing motion does not occur prior to the time that the buckets 52 assume their operating orientation.
  • the lower portion 62 ofthe windshield will drop to the open position at a rotational speed which is greater than the speed at which the buckets 52 drop toward the rest position.
  • the lower portion of the windshield is caused to move downwardly along the shaft to the open position.
  • FIG. 6 shown are alternate embodiments of the invention.
  • that part of the Figure shown to the right of the axis S of the rotor depicts the lower windshield portion 62 in the lower position while the part of the Figure to the left of the axis S shows the lower windshield portion 62 in the closed position.
  • the exterior surface of the shaft 14 is provided with a jack screw thread, as at 76.
  • the opening 66 in the central region 64 of the power portion 62 is correspondingly threaded as at 78 to form a nut fitting to the jack screw.
  • the lower windshield portion 62 is provided with a plurality of airfoils 82 along the periphery thereof.
  • the exact number, length, aspect ratio and angle of attack we selected so as to produce the least drag at the maximum rotor speed while still producing the closing force in the form of sufficient lift to move the lower portion 62 of the windshield to the closed position.
  • Figure 8 discloses an alternate embodiment of the invention in which a fluid is used to generate the closiong force to close the lower portion 62 of the windshield.
  • a cylindrical skirt 86 is attached to the central region 64 of the lower portion 62 of the windshield.
  • the skirt 14 on the hub 12 is spaced from the interior surface of the region 64 on the lower portion 62 of the windshield and is cooperable with the same and with the skirt 86 to define an annular cylinder 88 therebetween.
  • the annular cylinder 88 communicates with a vent volume 90 (shown in the form of a passage) defined within the rotor hub 12.
  • the cylinder 88 is sealed by O-rings 92 and 94.
  • a fixed volume of hydraulic fluid is disposed within the annular cylinder 88 (and perhaps into the volume 90).
  • FIG. 9 A further embodiment of the invention is shown in Figure 9.
  • linkages . 106 with midweights 108 are mounted intermediate bucket positions.
  • the linkages 106 are mounted between pivot pins 110 and 112 respectively disposed on the rotor and the lower portion 62 of the windshield. Centrifugal force acts on the weights 108 to urge them radially outwardly. A resulting closing force acts to lift the lower portion 62 to the closed position.
  • the Figure discloses the linkages 106 as extending between the rotor hub 12 and the lower portion 62 of the windshield, any other suitable interconnection may be used. Since this embodiment does not depend upon aerodynamic or pressure differential effects, it is believed best suited in reduced atmosphere environments.
  • Figure 10 shows an embodiment of the invention basically similar to that shown in Figures 1 through 5.
  • Guidewires 114 are securely attached in any convenient manner between the rotor 10 and lower portion 62. As the rotor rotates, the guidewires spiral generally tangentially to the direction of angular rotation, thus shortening the guidewires 114 to thereby assist the movement of the lower portion 62 of the windshield to the closed position.
  • centrifuge rotor of the winging bucket type which permits the maximum relative centrifugal force able to be generated by the rotor at a given rotor volume.

Landscapes

  • Centrifugal Separators (AREA)
EP83109379A 1982-09-29 1983-09-21 Centrifuge rotor having a closable windshield Expired EP0104600B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US427907 1982-09-29
US06/427,907 US4435169A (en) 1982-09-29 1982-09-29 Centrifuge rotor having a closable windshield

Publications (3)

Publication Number Publication Date
EP0104600A2 EP0104600A2 (en) 1984-04-04
EP0104600A3 EP0104600A3 (en) 1986-03-19
EP0104600B1 true EP0104600B1 (en) 1988-03-16

Family

ID=23696805

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83109379A Expired EP0104600B1 (en) 1982-09-29 1983-09-21 Centrifuge rotor having a closable windshield

Country Status (4)

Country Link
US (1) US4435169A (enrdf_load_stackoverflow)
EP (1) EP0104600B1 (enrdf_load_stackoverflow)
JP (1) JPS5980347A (enrdf_load_stackoverflow)
DE (1) DE3375980D1 (enrdf_load_stackoverflow)

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4624655A (en) * 1984-12-21 1986-11-25 E. I. Du Pont De Nemours And Company Restoring cap assembly for a centrifuge rotor having a flexible carrier
US4890947A (en) * 1988-10-26 1990-01-02 E. I. Du Pont De Nemours And Company Mounting adapter having locking taper removal arrangement
WO1993008675A1 (en) * 1991-10-21 1993-04-29 Beckman Instruments, Inc. Hybrid centrifuge sample container
US5344380A (en) * 1992-09-30 1994-09-06 Beckman Instruments, Inc. Release handle for centrifuge rotor and lid
EP0762940A1 (en) * 1994-06-15 1997-03-19 Massachusetts Institute Of Technology Locking centrifuge rotor cover assembly
US5415616A (en) * 1994-07-07 1995-05-16 Beckman Instruments, Inc. Rotor-protected evacuation port for centrifugal separation
US5591114A (en) * 1995-12-15 1997-01-07 Sorvall Products, L.P. Swinging bucket centrifuge rotor
US5624370A (en) * 1995-12-15 1997-04-29 Sorvall Products, L.P. Bucket for use in a swinging bucket centrifuge rotor
JP3314603B2 (ja) * 1996-01-31 2002-08-12 株式会社日立製作所 遠心力載荷試験装置
FR2770154B1 (fr) * 1997-10-23 1999-11-26 Jouan Centrifugeuse a rotor demontable et a dispositif de blocage axial du rotor sur une tete d'entrainement, et rotor pour une telle centrifugeuse
US5897482A (en) * 1998-03-04 1999-04-27 Beckman Instruments, Inc. Rotor lid tie-down and vacuum venting system
JP3840888B2 (ja) * 2000-09-18 2006-11-01 日立工機株式会社 遠心分離機及びそのロータ
US6665924B2 (en) * 2002-01-25 2003-12-23 Kendro Laboratory Products, L.P. Centrifuge having a spring-loaded nut for securing a rotor to a drive cone
US6764438B2 (en) * 2002-04-22 2004-07-20 Kendro Laboratory Products, Lp Cover attachment apparatus
US6802803B2 (en) * 2002-04-22 2004-10-12 Kendro Laboratory Products, Inc. Cover attachment apparatus
US7081081B2 (en) * 2002-04-22 2006-07-25 Kendro Laboratory Products, Lp Bayonet coupling mechanism for a centrifuge
US6776751B2 (en) * 2002-04-22 2004-08-17 Kendor Laboratory Products, Lp Rotor cover attachment apparatus
US6811531B2 (en) * 2002-04-22 2004-11-02 Kenneth J. Moscone, Sr. Horizontal centrifuge rotor
AU2003256999B2 (en) * 2002-08-02 2008-01-03 Harvest Technologies Corporation Decanting centrifuge with vibration isolation
US7011618B2 (en) * 2003-05-16 2006-03-14 Kendro Laboratory Products Lp Attachment and release apparatus for a centrifuge rotor cover
DE102004012025C5 (de) * 2004-03-10 2012-04-05 Eppendorf Ag Laborzentrifuge mit Ausschwingbehältern
US7407296B2 (en) * 2005-06-10 2008-08-05 Infocus Corporation Integrated light gathering reflector and optical element holder
US7422554B2 (en) * 2005-08-10 2008-09-09 The Drucker Company, Inc. Centrifuge with aerodynamic rotor and bucket design
JP4941877B2 (ja) * 2005-10-18 2012-05-30 日立工機株式会社 遠心分離機用ロータ及び遠心分離機
US7837607B2 (en) * 2006-12-13 2010-11-23 Thermo Fisher Scientific Inc. Centrifuge rotor assembly and method of connection thereof
DE202010014803U1 (de) * 2010-11-01 2010-12-30 Sigma Laborzentrifugen Gmbh Rotorlagerung für eine Laborzentrifuge
DE102014112501B4 (de) * 2014-08-29 2017-07-27 Andreas Hettich Gmbh & Co. Kg Zentrifuge
DE102015113855A1 (de) * 2015-08-20 2017-02-23 Andreas Hettich Gmbh & Co. Kg Rotor einer Zentrifuge
DE102015113854A1 (de) * 2015-08-20 2017-02-23 Andreas Hettich Gmbh & Co. Kg Rotor einer Zentrifuge
DE102017130787A1 (de) * 2017-12-20 2019-06-27 Eppendorf Ag Zentrifugenrotor

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE557084C (de) * 1932-08-18 Hans Jacques Fuchs Dr In einem Schutzgehaeuse sitzende Becherschleuder
US650529A (en) 1900-02-12 1900-05-29 Moriz Eggeman Centrifugal testing-machine.
US724801A (en) 1902-12-02 1903-04-07 Mandt Wagon Company Bolster-spring.
BE349062A (enrdf_load_stackoverflow) 1927-02-22
US2005094A (en) 1932-01-25 1935-06-18 Laval Separator Co De Centrifugal separator
US3028075A (en) 1959-01-12 1962-04-03 Sorvall Inc Ivan Swinging bucket centrifuge
GB1323471A (en) * 1969-08-22 1973-07-18 Aga Ab Centrifuge attachments
GB1541424A (en) 1975-08-08 1979-02-28 Fisons Ltd Centrifuge and lid therefor
US4010890A (en) 1976-01-28 1977-03-08 Beckman Instruments, Inc. Centrifuge rotor lid
US4046317A (en) 1976-04-29 1977-09-06 Norton George Hein Jr Air levitation device for an air driven centrifuge

Also Published As

Publication number Publication date
EP0104600A2 (en) 1984-04-04
EP0104600A3 (en) 1986-03-19
DE3375980D1 (en) 1988-04-21
JPS6144543B2 (enrdf_load_stackoverflow) 1986-10-03
JPS5980347A (ja) 1984-05-09
US4435169A (en) 1984-03-06

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